JPH0993155A - Data radio transmitter-receiver - Google Patents

Data radio transmitter-receiver

Info

Publication number
JPH0993155A
JPH0993155A JP7250808A JP25080895A JPH0993155A JP H0993155 A JPH0993155 A JP H0993155A JP 7250808 A JP7250808 A JP 7250808A JP 25080895 A JP25080895 A JP 25080895A JP H0993155 A JPH0993155 A JP H0993155A
Authority
JP
Japan
Prior art keywords
data
wave
interfering wave
interfering
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7250808A
Other languages
Japanese (ja)
Inventor
Shigeru Komatsu
繁 小松
Original Assignee
Nec Corp
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corp, 日本電気株式会社 filed Critical Nec Corp
Priority to JP7250808A priority Critical patent/JPH0993155A/en
Publication of JPH0993155A publication Critical patent/JPH0993155A/en
Pending legal-status Critical Current

Links

Abstract

Kind Code: A1 Abstract: It is possible to predict the generation cycle of an interference wave and the rising and falling timings of an interference wave signal without increasing the device size and the signal processing scale, and to retransmit a transmission collision by carrier sense. Avoid frequent occurrences and perform efficient wireless data transmission. An interfering wave period / timing determination circuit 5 outputs an interfering wave data in which a period of the interfering wave and timings of rising and falling of the interfering wave signal are determined from a received signal output from a receiving section. This interference wave data is output to the cycle / timing storage circuit 7 and stored. The transmission permission circuit 8 predicts the time when the disturbance wave is not generated based on the stored disturbance wave data of the cycle and timing, and sends the data transmission permission signal to the data transmission circuit 3. When the data transmission circuit 3 receives the permission signal, the external I / F
The data from the circuit 9 is modulated by the spread spectrum modulation method, and the data is wirelessly transmitted through the transmitter 2 and the antenna 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data wireless transmission / reception apparatus which employs a spread spectrum method or the like, detects an interference wave, and wirelessly transmits data during a time when the interference wave does not occur.

[0002]

2. Description of the Related Art Conventionally, the detection of an interfering wave in a wireless transmission device is a method of determining whether or not energy exists in a used frequency band, as defined by the wireless LAN standard (RCR-STD-18). Is used.

Another method is disclosed in Japanese Patent Laid-Open No. 5-374.
No. 90, "Spread spectrum wireless communication device" is known. In this example of the publication, the signal power is detected from the correlation detection result, and the total received power is detected from the total received input level. Further, the signal power is subtracted from the total received power to obtain the interfering wave power, and the ratio between the signal power and the interfering wave is determined. When the signal power to interfering wave power ratio (SIR) is lower than the reference value, The alarm is issued.

This allows mobile stations such as mobile phones to
When moving during a call and the signal power to interfering wave power ratio deteriorates, the caller can know the deterioration of the communication state, and the antenna position is displaced or the receiving place is moved. , It is possible to avoid the communication interruption by receiving with a good electric field strength.

[0005]

In the former example of the above-mentioned conventional example, when data is wirelessly transmitted in the ISM band used in the wireless LAN, carrier sensing is performed and then the data is transmitted. ing. This ISM
In the band, high-frequency devices such as microwave ovens and medical hyperthermia devices are often used, and energy in the frequency band used by devices that periodically generate interfering waves such as microwave ovens is detected as carriers. .
Therefore, if the timing is incorrect, the number of retransmissions increases and efficient data transmission cannot be achieved.

Further, the latter prior art disclosed in Japanese Patent Laid-Open No. 5-37490 is capable of avoiding communication interruption by issuing an alarm when the signal power to interfering wave power ratio (SIR) falls below a reference value. The configuration becomes complicated, and the processing amount of software also increases. That is, there is a drawback that the device scale and the signal processing scale increase.

The present invention solves the problems in the prior art as described above, and the generation cycle of an interference wave and the rise and fall of this interference wave signal are achieved without increasing the device scale and the signal processing scale. There is provided a data wireless transmission / reception device capable of predicting the timing in advance, avoiding frequent retransmission of transmission collisions due to carrier sense, and enabling efficient wireless transmission of data.

[0008]

In order to achieve the above-mentioned object, a data wireless transmission / reception apparatus of the invention according to claim 1 has a receiving means for receiving wireless data, and an interference in a received signal output by the receiving means. Interference based on the interfering wave period / timing determining means for detecting interfering wave data indicating the period of the wave and the rising and falling timings of the interfering wave signal, and the interfering wave data detected by the interfering wave period / timing determining means It is configured to include a transmission permission unit that outputs a transmission permission signal during a time when a wave does not occur, and a wireless transmission unit that wirelessly transmits data during a time based on the transmission permission signal detected by the transmission permission unit.

A data wireless transmission / reception apparatus according to a second aspect is
Storage means for storing the interference wave data detected by the interference wave cycle / timing determination means is provided, and the interference wave data stored in the storage means is stored each time the interference wave cycle / timing determination means detects an interference wave. It is configured to be rewritten.

A data wireless transmission / reception apparatus according to claim 3 is
The interfering wave period / timing determining means detects the period of the interfering wave detected by the interfering wave period / timing determining means and the interfering wave data at the rising and falling timings of the interfering wave signal When the interfering wave data of is different from the interfering wave data previously stored in the accumulating means, referring to the accumulating means, predicting and reading the interfering wave data subsequent to the interfering wave generated this time,
The transmission permitting means transmits a transmission permitting signal to wirelessly transmit the data between the respective times when the read continuous interference wave does not occur.

A data wireless transmission / reception apparatus according to a fourth aspect is
The receiving unit and the transmitting unit are configured to transmit and receive data processed by a spread spectrum system.

A data wireless transmission / reception device according to a fifth aspect,
The interference wave cycle / timing determination means stores in advance the cycle corresponding to the frequency of the AC power supply supplied to the device that generates the interference wave, and the interference wave data at the rising and falling timings of this interference wave signal. Each time the reception signal from the receiving means and the receiving means is supplied, the interfering wave data is read from the storing means, the interfering wave data is checked whether or not the received signal exists, and the interfering wave is detected. is there.

A data radio transmitting / receiving apparatus according to claim 6 is
The data received by the receiving unit is output to an external device via an external interface unit, and the data from the external device is received by the wireless transmitting unit via the external interface unit and wirelessly transmitted.

The data radio transmitter / receiver according to the present invention having the above-mentioned structure is based on the period of the disturbing wave and the disturbing wave data of the rising and falling timings of the disturbing wave signal. , The data is wirelessly transmitted by a spread spectrum method or the like during the time when the interfering wave does not occur. In this case, each time the received signal is supplied,
The stored interfering wave data is read out and the interfering wave data is detected by referring to the received signal. In addition, data is transmitted and received through the external interface unit.

Therefore, the generation cycle of the interference wave and the rising and falling timings of the interference wave signal can be predicted in advance without increasing the scale of the apparatus and the signal processing scale, and the frequent occurrence of retransmission of transmission collision due to carrier sense. By avoiding the above, efficient wireless transmission of data is performed.

A data wireless transmission / reception device according to claim 2 is
Every time an interfering wave is detected, the stored interfering wave data is rewritten, corresponding to the interfering wave data being generated,
Data can be wirelessly transmitted during the time when the interfering wave is not generated.

A data wireless transmission / reception device according to claim 3 is
When the disturbing wave data this time is different from the previously stored disturbing wave data, the disturbing wave data following this disturbing wave is predicted, and the disturbing wave corresponding to this consecutive disturbing wave data is generated. No, since data is wirelessly transmitted between the respective times, even when a plurality of types of interfering waves are generated, the interfering waves can be dealt with.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a data wireless transmitting / receiving apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a data wireless transmission / reception apparatus of the present invention. The example of FIG. 1 is for transmitting and receiving data in a spread spectrum method in the ISM band, and an antenna 1 for performing wireless transmission and reception,
It has a transmitter 2 for performing spread modulation of data by a spread spectrum method and wirelessly transmitting a high frequency signal thereof through an antenna 1.

Further, while the transmission permission signal is being output, the data transmission circuit 3 that transfers the data input from the external device to the transmission unit 2 and the reception signal from the antenna 1 are amplified, and the frequency conversion and Receiver 4 that processes demodulation, etc.
Then, from the output signal from the receiving unit 4, for example, a period of twice the commercial AC power source is determined to detect an interfering wave, and
An interfering wave period / timing determination circuit 5 is provided for sending out the interfering wave data in which the period of the interfering wave and the rising and falling timings of the interfering wave signal are decided. In addition, the reception section 4 receives the spread modulation by the spread spectrum method and sends the despread data to an external device. The data receiving circuit 6 and the cycle for storing the interfering wave data sent by the interfering wave cycle / timing determining circuit 5 / Timing storage circuit 7.

Further, based on the interfering wave data stored in the cycle / timing storage circuit 7, a time period after that when no interfering wave exists (hereinafter referred to as time) is predicted,
At this time, the transmission permission circuit 8 which transmits the transmission permission signal to the data transmission circuit 3, and the data from the external device is transmitted to the data transmission circuit 3, and the data output from the data reception circuit 6 is transmitted to the external device. And an external I / F circuit 9 for

Next, the operation of this embodiment will be described. FIG. 2 is a timing chart showing processed signals and their timings when performing communication. In FIGS. 1 and 2, alternating current having the commercial power supply frequency shown in FIG. 2 (a) is supplied to a microwave oven or the like, and as shown in FIG. 2 (b), it is repeated twice as much as the commercial power supply frequency. Interfering wave of frequency is generated. Communication becomes impossible during the time when this interfering wave is generated. That is, the carrier sense circuit (not shown) detects the carrier of the interference wave and repeats the retransmission.

This interfering wave is received by the receiving section 4, and from the output signal thereof, the period T1 of the interfering wave shown in FIG. 2B and the rising and falling timings T of this interfering wave signal.
2 is determined by the interference wave cycle / timing determination circuit 5. The interference wave data of the determined cycle T1 and timing T2 is output to the cycle / timing storage circuit 7 and stored therein. Then, the transmission permission circuit 8 predicts the time when the interference wave does not occur based on the interference wave data stored in the cycle / timing storage circuit 7, and corresponds to this predicted time, and FIG.
A permission signal for wirelessly transmitting data is transmitted to the data transmission circuit 3 shown in (c). The data transmission circuit 3, which has received the permission signal for wireless transmission of this data, modulates the data from the external I / F circuit 9 by the spread spectrum modulation method at the time of this permission signal and sends it to the transmission unit 2 for transmission. Wireless transmission is performed from the section 2 through the antenna 1 as shown in FIG.

In this case, the cycle / timing storage circuit 7 rewrites the data of the cycle T1 and the timing T2 of the disturbing wave every time the disturbing wave is taken in. At this time, the cycle and timing of the interference wave determined this time are compared with the previous cycle and timing stored in the cycle / timing storage circuit 7, and if different here, the interference wave data of the new cycle and timing is stored. To do.

When a plurality of types of interfering waves having different periods and timings are generated, the wireless transmission of data is performed at a plurality of different times when the respective interfering waves of the plurality of types of interfering waves are not generated. You can also do it. In this case, first, the interference wave cycle / timing determination circuit 5 outputs the interference wave cycle and timing interference wave data to the cycle / timing storage circuit 7 every time the interference wave data is fetched. Wave data is sequentially stored and accumulated.

Then, the interfering wave cycle / timing determining circuit 5 reads out the cycle and timing of the interfering wave previously determined at the time of determining the interfering wave this time from the cycle / timing storing circuit 7 and compares them, and the cycle and timing. If it is different from the above, it is considered that a plurality of types of interfering waves are generated, and a plurality of types of interfering wave data that match the generation pattern of the plurality of types of interfering waves are read from the cycle / timing storage circuit 7. Then, of the interfering waves, the time when each of the interfering waves is not generated is predicted, and a data transmission permission signal is sent to the data transmitting circuit 3, and the data transmitting circuit 3 wirelessly transmits the data.

[0026]

As is apparent from the above description, according to the data wireless transmission / reception apparatus of the invention described in claims 1 and 4 to 6, the time interval during which the interfering wave does not occur is based on the interfering wave data of the interfering wave. Since the data is wirelessly transmitted to the device, the generation period of the interference wave and the rising and falling timings of the interference wave signal can be predicted in advance without increasing the device scale and the signal processing scale. It becomes possible to efficiently transmit data wirelessly by avoiding frequent retransmissions.

According to the data wireless transmission / reception apparatus of the second aspect, the stored interference wave data is rewritten each time an interference wave is detected, and the stored interference wave data is rewritten corresponding to the generated interference wave data. It becomes possible to wirelessly transmit data during a time when an interfering wave does not occur, which enables more efficient wireless transmission of data.

According to the data wireless transmission / reception apparatus of the third aspect, when the interference wave data of this time is different from the previously stored interference wave data, the interference wave data subsequent to the interference wave of this time is transmitted. By predicting, the interference wave corresponding to this continuous interference wave data does not occur.Because the data is wirelessly transmitted between each time, it is possible to respond to this interference wave even when multiple types of interference waves occur. In addition, more efficient wireless transmission of data becomes possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a data wireless transmission / reception device of the present invention.

FIG. 2 is a timing chart showing a processing signal and its timing when performing communication in the embodiment. (A)
Shows the power supply frequency waveform supplied to the device generating the interference wave. (B) shows the generation state of the interfering wave.
(C) has shown the permission signal which instruct | indicates transmission, and its timing. (D) shows the wireless transmission wave of data and its timing.

[Explanation of symbols]

 1 Antenna 2 Transmitter 3 Data Transmitter 4 Receiver 5 Interfering Wave Cycle / Timing Judgment Circuit 6 Data Receiver 7 Cycle / Timing Memory 8 Transmission Permission Circuit 9 External I / F Circuit

Claims (6)

[Claims]
1. Receiving means for receiving wireless data, and detecting interfering wave data indicating a cycle of an interfering wave in a received signal output by the receiving means, and rising and falling timings of the interfering wave signal. Interfering wave cycle / timing determining means, transmission permitting means for issuing a transmission permitting signal based on the interfering wave data detected by the interfering wave cycle / timing determining means during a time when an interfering wave does not occur, and detecting from the transmitting permitting means A wireless transmission unit that wirelessly transmits data during a time based on the transmission permission signal.
2. A storage unit is provided for storing the interference wave data detected by the interference wave period / timing determination unit, and is stored in the storage unit each time the interference wave period / timing determination unit detects an interference wave. 2. The data wireless transmission / reception device according to claim 1, wherein the data of the interfering wave being generated is rewritten.
3. An interfering wave period / timing is provided with a storage unit for accumulating the period of the interfering wave detected by the interfering wave period / timing determining means and the interfering wave data of the rising and falling timings of the interfering wave signal. When the interfering wave data of this time detected by the judging means is different from the interfering wave data previously stored in the accumulating means, the accumulating means is referred to and the interfering wave data subsequent to the interfering wave generated this time are displayed. It predicts and reads, and the continuous disturbance wave read out does not occur,
2. The data wireless transmission / reception apparatus according to claim 1, wherein the transmission permission means transmits a transmission permission signal to wirelessly transmit the data between the respective times.
4. The data wireless transmitting / receiving apparatus according to claim 1, wherein the receiving means and the transmitting means transmit / receive data processed by a spread spectrum method.
5. The interfering wave period / timing determining means has a period corresponding to a frequency of an AC power supply supplied to a device that generates an interfering wave, and interfering wave data of rising and falling timings of the interfering wave signal. A storage means for storing in advance, every time the reception signal from the reception means is supplied, read the interference wave data from the storage means, and check whether this interference wave data exists in the reception signal. The data wireless transmission / reception device according to claim 1, wherein the interfering wave is detected.
6. The data received by the receiving unit is output to an external device through an external interface unit, and the data from the external device is fetched through the external interface unit and wirelessly transmitted. The data wireless transmission / reception device according to claim 1.
JP7250808A 1995-09-28 1995-09-28 Data radio transmitter-receiver Pending JPH0993155A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7250808A JPH0993155A (en) 1995-09-28 1995-09-28 Data radio transmitter-receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7250808A JPH0993155A (en) 1995-09-28 1995-09-28 Data radio transmitter-receiver

Publications (1)

Publication Number Publication Date
JPH0993155A true JPH0993155A (en) 1997-04-04

Family

ID=17213361

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7250808A Pending JPH0993155A (en) 1995-09-28 1995-09-28 Data radio transmitter-receiver

Country Status (1)

Country Link
JP (1) JPH0993155A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6724777B1 (en) 1998-09-01 2004-04-20 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Wireless data communication system having improved data communication efficiency
JP2008028641A (en) * 2006-07-20 2008-02-07 Denso Wave Inc Data transmission device
JP2010147708A (en) * 2008-12-17 2010-07-01 Panasonic Electric Works Co Ltd Communication system
JP2010212766A (en) * 2009-03-06 2010-09-24 Toyota Industries Corp Vehicular radio communication system
WO2012124751A1 (en) * 2011-03-17 2012-09-20 パナソニック株式会社 Communication system and communication method
US9444575B2 (en) 2013-11-05 2016-09-13 Panasonic Intellectual Property Management Co., Ltd. Wireless communication system, receiver, transmitter, and transmission rate control method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6724777B1 (en) 1998-09-01 2004-04-20 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Wireless data communication system having improved data communication efficiency
JP2008028641A (en) * 2006-07-20 2008-02-07 Denso Wave Inc Data transmission device
JP4548394B2 (en) * 2006-07-20 2010-09-22 株式会社デンソーウェーブ Data transmission equipment
JP2010147708A (en) * 2008-12-17 2010-07-01 Panasonic Electric Works Co Ltd Communication system
JP2010212766A (en) * 2009-03-06 2010-09-24 Toyota Industries Corp Vehicular radio communication system
WO2012124751A1 (en) * 2011-03-17 2012-09-20 パナソニック株式会社 Communication system and communication method
JP2012195860A (en) * 2011-03-17 2012-10-11 Panasonic Corp Communication system, and communication method
US9014234B2 (en) 2011-03-17 2015-04-21 Panasonic Intellectual Property Management Co., Ltd. Communication system and communication method
US9444575B2 (en) 2013-11-05 2016-09-13 Panasonic Intellectual Property Management Co., Ltd. Wireless communication system, receiver, transmitter, and transmission rate control method

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